#                            -*- shell-script -*-
#
# Copyright by The HDF Group.
# All rights reserved.
#
# This file is part of HDF5.  The full HDF5 copyright notice, including
# terms governing use, modification, and redistribution, is contained in
# the LICENSE file, which can be found at the root of the source code
# distribution tree, or in https://www.hdfgroup.org/licenses.
# If you do not have access to either file, you may request a copy from
# help@hdfgroup.org.


# This file should be sourced into configure if the compiler is the
# Clang Fortran compiler (flang) or a derivative.  It is careful not to do
# anything if the compiler is not Clang; otherwise 'cc_flags_set' is set
# to 'yes'
#

# Get the compiler version in a way that works for clang
# unless a compiler version is already known
#
#   cc_vendor:    The compiler name: flang
#   cc_version:   Version number: 6.0.0, 7.3.0, ... 10.0.1
#
if test "X-" = "X-$f9x_flags_set"; then
    # flang -v will return version number following "clang"
    f9x_version="`$FC $FCFLAGS $H5_FCFLAGS -v 2>&1 |\
        grep 'clang version' | sed 's/.*clang version \([-a-z0-9\.]*\).*/\1/'`"
    if test -n "$f9x_version"; then
        f9x_vendor="flang"
    fi
    if test "X-" != "X-$f9x_version"; then

        # Get the compiler version numbers
        f9x_vers_major=`echo $f9x_version | cut -f1 -d.`
        f9x_vers_minor=`echo $f9x_version | cut -f2 -d.`
        f9x_vers_patch=`echo $f9x_version | cut -f3 -d.`
        test -n "$f9x_vers_major" || f9x_vers_major=0
        test -n "$f9x_vers_minor" || f9x_vers_minor=0
        test -n "$f9x_vers_patch" || f9x_vers_patch=0
    fi
fi

if test "X-flang" = "X-$f9x_vendor"; then

    echo "compiler '$FC' is $f9x_vendor-$f9x_version"

    FC_BASENAME=flang
    F9XSUFFIXFLAG=""
    FSEARCH_DIRS=""

    ###############################
    # Architecture-specific flags #
    ###############################

    arch=
    # Nothing currently. (Uncomment code below and modify to add any)
    #case "$host_os-$host_cpu" in
    #    *-i686)
    #        arch="-march=i686"
    #        ;;
    #esac

    H5_FCFLAGS="$H5_FCFLAGS $arch"

    ##############
    # Production #
    ##############

    PROD_FCFLAGS=

    #########
    # Debug #
    #########

    DEBUG_FCFLAGS=

    ########################
    # Enhanced Diagnostics #
    ########################

    NO_DIAGS_FCFLAGS=
    DIAGS_FCFLAGS=

    ###########
    # Symbols #
    ###########

    NO_SYMBOLS_FCFLAGS=
    SYMBOLS_FCFLAGS=

    #############
    # Profiling #
    #############

    PROFILE_FCFLAGS=

    ################
    # Optimization #
    ################

    HIGH_OPT_FCFLAGS="-O3"
    NO_OPT_FCFLAGS="-O0"
    DEBUG_OPT_FCFLAGS="-O0"

    ############
    # Warnings #
    ############

    ###########
    # General #
    ###########

    # We don't use OpenMP, so don't link to it
    H5_FCFLAGS="$H5_FCFLAGS -nomp"

    ######################
    # Developer warnings #
    ######################

    NO_DEVELOPER_WARNING_FCFLAGS=
    DEVELOPER_WARNING_FCFLAGS=

    #############################
    # Version-specific warnings #
    #############################

    #################
    # Flags are set #
    #################
    f9x_flags_set=yes
fi

# Clear f9x info if no flags set
if test "X$f9x_flags_set" = "X"; then
    f9x_vendor=
    f9x_version=
fi
